Hi, does anyone have advice on using effects-coded model for MRS/WTP estimation in DCE.

Assuming I have a continuous price variable (price) and a categorical car model variable with 3 categories (car1, car2 , car3 )

In a dummy coded mixlogit model (with X3 being the reference), I would use the nlcom command "nlcom (_b[car2])/(_b[lprice])" to estimate the MRS for car2 compared to car3.

However, if I have to run an effects coded model, how can i estimate the MRS of car 1 vs car3? Say car 3 is the omitted variable whose coefficient from the mixlogit is derived from the negative sum of car1 and car2.

Would the command then be "nlcom (_b[car1]-(-(_b[car1]+_b[car2])))/(_b[lprice])"?

Thanks!